Did Mother Mopar not design in enough thread length
in the aluminum threaded holes
for 8.8 steel M8 1.25 pan bolts
at the bottom of the case of the 41 automatic transmission ?
http://genfast.com/wp-content/uploa...Engagement-Bolt-Failure-Chart-Metric.pdfLook at the 2nd line,
the one colored white for M8 1.25
and continue over right to the 7th material column
where the nut material is aluminum A356 with temper T6
The engaged threads of steel bolt to aluminum nut must be longer than
16.8 mm ( 0.66 inches)
The cast aluminum in the case of the 41 automatic is probably weaker than A356-T6 aluminum in a nut.
To snap the steel bolt head off
rather than pull the threads out of the aluminum hole
the engaged thread length should have been more than 16.8 mm, maybe 18 to 25 mm
These Chrysler small hex head
steel M8 1.25 bolts
seem to have only
5.5 mm of engaged thread
if you subtract the thickness of threads held back from engaging the aluminum
by the thickness of the steel pan.
FSM says these M8 bolts should have been hand torqued to just 165 inch-lbs ( 14 ft-lbs/ 19 N-m )
